The investigation on the mechanical properties of Ti-55M alloy weldments showed that the autogenous gas tungsten arc weldments exhibit low room temperature weld ductility. Through analyzing the factors that affect the weld ductility, a modulation of weld compositions has been carried out and the Ti-5Al-2.5Sn ELI was selected as filler metal. Combined with pulsed current arc welding technique and appropriate postweld heat-treatment, the weld ductility nearly as high as that of base metal was achieved. At the same time the most important strength-concerning properties such as room temperature and high temperature strengths, and high temperature endurance of weldments, still can meet the base metal specifications.
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